Weather in Charleston SC by month can feel confusing at first. You check a few sites, see numbers and charts, and still wonder if it will feel comfortable or too hot to enjoy.
That’s the real issue. Temperature alone does not tell the full story. In Charleston, humidity, coastal air, and short rain bursts change how each day feels.
Charleston weather is mild in winter, hot and humid in summer, with short bursts of rain.
This guide keeps it simple. You get clear monthly data plus real-life explanations so you know exactly what to expect.
Charleston SC Weather by Month – Quick Overview
Charleston has mild winters, hot humid summers, and steady rainfall with a summer peak.
Charleston’s coastal location makes humidity a key part of its climate. Air from the nearby Atlantic Ocean keeps conditions warm but also adds moisture.
Humidity often makes the air feel heavy, like walking through warm, damp air. A day that looks like 85°F can feel closer to 95°F.
Rain usually comes in short afternoon storms, not full-day rain, so plans are rarely fully affected.
Charleston Weather at a Glance
- Warmest months: July, August
- Coolest months: January, February
- Most humid: June to August
- Most rain: Summer months
- Most comfortable feel: March, April, October
Charleston Weather by Month Table (Temperature, Rainfall, Humidity)
This table shows average monthly temperature Charleston SC along with rainfall and humidity.
| Month | Avg High | Avg Low | Rainfall | Humidity | What It Feels Like |
|---|---|---|---|---|---|
| Jan | 60°F | 40°F | Low | Low | Cool, easy to walk |
| Feb | 63°F | 43°F | Low | Low | Calm, slightly cool |
| Mar | 70°F | 50°F | Medium | Low | Fresh and pleasant |
| Apr | 77°F | 57°F | Medium | Low | Warm, very comfortable |
| May | 84°F | 65°F | Medium | Rising | Warm, light humidity |
| Jun | 89°F | 72°F | High | High (sticky) | Hot, humid afternoons |
| Jul | 92°F | 75°F | High | Very high (heavy air) | Very hot, tiring |
| Aug | 91°F | 75°F | High | Very high (heavy air) | Hot, thick air |
| Sep | 87°F | 71°F | High | High (humid) | Warm, storm risk |
| Oct | 79°F | 60°F | Medium | Medium | Comfortable |
| Nov | 70°F | 50°F | Low | Low | Mild and easy |
| Dec | 63°F | 43°F | Low | Low | Cool and calm |
Rain Note
Rain in Charleston is usually short and heavy, especially in summer.
Month-by-Month Weather in Charleston SC
Short answer: The year moves from cool to warm, then hot, then comfortable again.
January Weather in Charleston
Avg high around 60°F. Cool and calm. Great for long walks without sweating.
February Weather in Charleston
Avg high near 63°F. Slightly warmer but still mild and dry.
March Weather in Charleston
Avg high around 70°F. Fresh air and low humidity make it comfortable.
April Weather in Charleston
Avg high near 77°F. Warm days with low humidity. Great for outdoor time.
May Weather in Charleston
Avg high around 84°F. Warm with rising humidity by afternoon.
June Weather in Charleston
Avg high near 89°F. Heat builds fast. Short afternoon rain becomes more common.
Real Insight
Mornings feel much better than afternoons in June.
July Weather in Charleston
Avg high around 92°F. Peak heat and humidity. Rain is frequent but usually short.
Real Insight
Many visitors feel tired faster than expected because the air feels heavy.
August Weather in Charleston
Avg high near 91°F. Very hot with heavy air. Storms happen often but pass quickly.
September Weather in Charleston
Avg high around 87°F. Still warm. Storm chances remain higher than most months.
October Weather in Charleston
Avg high near 79°F. Cooler air and lower humidity bring relief.
November Weather in Charleston
Avg high around 70°F. Mild and relaxed. Easy for outdoor plans.
December Weather in Charleston
Avg high near 63°F. Cool but comfortable. Light layers work well.
Charleston Climate by Season (Spring, Summer, Fall, Winter)
Short answer: Spring and fall feel balanced, summer feels heavy, and winter stays mild.
Charleston’s climate depends more on humidity than temperature alone. That is why two months with similar temperatures can feel very different.
Spring Weather (March–May)
Mild and warming. Starts fresh and becomes slightly humid later.
Summer Weather (June–August)
Hot and humid. Rain comes in short afternoon storms.
Fall Weather (September–November)
Starts warm, then becomes cooler and easier to enjoy.
Winter Weather (December–February)
Cool and calm. No extreme cold.
Key Weather Patterns in Charleston SC
Short answer: Heat, humidity, and summer rain shape the year.
These patterns help you understand Charleston weather fast. They also explain why the same temperature can feel easy in one month and heavy in another.
Hottest Months in Charleston
July and August feel the hottest due to humidity.
Coldest Months in Charleston
January and February are the coolest.
Rainiest Months in Charleston
Rain peaks from June to September.
Humidity Levels Throughout the Year
Humidity is low in winter. It builds in spring and peaks in summer.
Hurricane Season in Charleston SC
Hurricane season runs from June to November, with the highest risk from August to October.
Weather Comparison by Month (Comfort & Conditions)
This quick comparison helps you scan the year without reading every monthly detail again.
| Category | Months | Why |
|---|---|---|
| Most comfortable | March, April, October | Mild temps + low humidity |
| Most humid | June, July, August | High heat + coastal moisture |
| Most rain | July, August, September | Frequent short storms |
What Charleston Weather Feels Like Throughout the Year
Charleston climate is shaped by coastal air and humidity. This makes the weather feel different from what numbers suggest.
Winter feels light and easy. Spring feels fresh. Summer feels heavy and tiring, especially in the afternoon. Fall brings relief.
Real Insight
Many first-time visitors are surprised by how quickly heat builds during the day.
Common Mistake
Many people pack based only on temperature and forget about humidity.
Quick Checklist: What to Expect Each Time of Year
- Winter: Cool, low humidity, easy walking
- Spring: Warm, pleasant, slightly humid later
- Summer: Hot, sticky, short storms
- Fall: Cooling down, more comfortable
FAQ – Charleston Weather by Month
What is the weather like in Charleston SC year round?
Mild winters, hot summers, and steady rainfall with a summer peak.
What is the hottest month in Charleston SC?
July is the hottest, followed by August.
What is the coldest month in Charleston SC?
January is the coolest month.
What is the rainiest month in Charleston SC?
Summer months, especially July and August.
Does Charleston have a rainy season?
Yes, summer has the most rain.
Is Charleston humid all year?
No. Humidity is low in winter and high in summer.
Does it snow in Charleston SC?
Snow is very rare.
Conclusion
Weather in Charleston SC by month becomes simple once you look at patterns instead of just numbers. Winter stays mild and easy. Summer turns hot, humid, and heavy. Spring and fall offer more balanced conditions.
From experience, the biggest mistake is ignoring humidity. A day that looks comfortable on paper can feel much hotter and more tiring in real life. If you keep this in mind, you can quickly understand any month and know exactly what to expect.
